Paper making



y 8, 1934- H. w FIEBEIRTS 1,957,824

PAPER MAK I NG Filed June 2, 1953 76.? luvs/v 7-02 HA RHY MFJEBERTB 47'7'0RNEY6 Patented May 8, 1934 UNITED STATES PATENT OFFICE 1,957,824 PAPER MAKING York Application June 2, 1933, Serial No. 614,003 15 Claims. (01. 92-43) My invention relates to paper and more particularly to an improved method of making the same and to an improved type of cylinder machine by means of which the method may be employed.

In the common type of cylinder machine the flow of stock to thevat must be closely regulated in order to obtain the proper formation on the mold. The thickness of the paper depends not only upon the kind of stock, its consistency, its freeness, and the speed of the mold, but also upon the differential in head between the stock about the exterior of the mold and the white water, inside. For this reason, any given stock must be supplied to the mold at a substantially uniform rate equal to the rate at which it can be utilized by the mold or cylinder to form a mat of the desired thickness. This rate is comparatively slow.

The advantages of maintaining the stock in rapid circulation after it passes the screens has been recognized and, instead of supplying stock to the pool about the mold at a rate equal to the relatively slow rate at which it is utilized by the mold, it has been proposed to create a more or less rapid flow of stock past the mold byproviding an overflow passage for thestock from the pool about the mold. Although the flow of stock about the mold in such case is in the direction in which the mold turns, it nevertheless disturbs the mat formation and it is impossible, for this reason, to increase the rate of stock flow substantially in excess of that in machines of the older type.

The principal object of my invention is to provide a method of procedure and a machine of the cylinder type whereby the rate of stock circulation between the mixing box and machine is practically unlimited and whereby, at the same 40 time, the stock is fed to the cylinder at a rate approximating its capacityto utilize-the same,

thus attaining the advantages of rapid circulation of relatively large volumes of stock while avoiding the disturbing effects on the formation' of passing such volumes through the pool about the mold.

My invention therefore includes the novel elements and combinations and arrangements thereof described below and illustrated in the accompanying drawing, in which Fig. 1 is a side view partly in section and partly in elevation showing my machine; and Fig. 2 is a fragmentary perspective view of the vat illustrating an adjustable baflle therein.

Referring to the drawing, my invention comtween the mold and the opening 6 are the usual prises the usual vat 1, in which, near one end,

is rotatively mounted the usual cylinder mold 2 adapted to turn with its lower portions submerged in a pool of stock in the vat. 3 is the mixing box into which stock flows from the screen through pipe 4. f. From the mixing box, the stock flows through the pipe 5 and is delivered into the bottom of the vat 1 through the opening 6 between the bafiies or partitions I and 8. Bebaflles 9 and 10. The usual opening 11, communicating with the interior of the mold for the withdrawal of white water, is provided and the white water is withdrawn by the pump 12 through pipe 13. The pump delivers the water to the screen (not shown) through the pipe 14, and also into the mixing box 3 through the pipe 15 provided with a regulating valve 16. On the opposite side of baflle or partition 8 from the opening 6 for the admission of stock is an opening 17 for the egress of stock. This opening communicates with pump 12 through pipes 18and 19.

Baflle or partition 8 is provided at the top with an adjustable crest 20 which may be raised or lowered to regulate the amount of stock flowing thereover. Attached to the crest at opposite sides of the vat are screws 21 and 22 which extend upwardly through bearings 23 and 24. These bearings support, on their upper surfaces, worm wheels 25 and 26 which are interiorly threaded to engage the screws 21 and 22. Extending transversely of the vat is ashaft 2'7, supported in suitable bearings 31 and 32, and provided at one or both ends with a crank 28. Worms 29 and 30, coacting with the worm wheels 25 and 26 respectively, are mounted on shaft 27. There is provided the usual overflow opening 33 communicating with the interior of the mold and having an adjustable gate or crest 34 which can be raised or lowered 'by hand wheel 35. l

In operation, screened stock flows into the mix? ing box through the pipe 4 and out the pipe 5 through the opening 6 into the vat 1. The stock flows upwardly between the bafiles or partitions 7 and 8 and over the tops of both thereof in the direction of the arrows. By means of the crank 28 the height of the crest of baflle 8 is so adjusted that stock flows over the bafile 7 at a rate approximating the capacity of the mold to utilize the same. The balance and excess of stock passes over crest 20 and out the pipe 18'through the pump 12 which also withdraws white water from the interior of the mold. The volume ofstock flowing over baflle 8 is substantially greater'than that flowing over the bafile 7 and this relatively large volume of stock is re-delivered by the pump both to the screen and the mixing box. Since relatively large volumes are discharged into the mixing box through the pipe 15, the stock there- 'in is continuously agitated so that any tendency of the fibers to collect in bundles or masses due to the slow circulation is substantially eliminated.

From the foregoing it will be observed that large volumes of stock are continuously in circulation between the mixing box and the vat and that the volume which can be maintained in continuous circulation is independent of the volume of stock required by the mold. When the character of the stock changes for any reason, it is not necessary to regulate several valves in order to maintain the proper depth of the stock in the pool about the mold to obtain the desired mat formation. By raising or lowering the crest 20 by means of crank 28, the total inflow of stock to the vat may be properly fractionated between the mold and the overflow. This regulating means is very close to the mold itself and the operator may observe the effect on the mat formation as he raises and lowers the crest 20.

Generally speaking my process consists in supplying stock to the vatin quantities substantially in excess of that which can be utilized by the mold, withdrawing from this supply and delivering to the mold only enough stock to obtain the desired mat formation, and recirculating the excess stock between the vat and the mixing box or screen, or both. In this way the advantages of continuously circulating the stock in large volumes is thus attained without creating a rapid flow of i f stock through the pool about the cylinder mold and thereby interfering with the mat formation thereon. 1.

While I have described my invention in its preferred embodiment, it is to be understood that the words which I have used are words of description and not of limitation. Hence, changes within the purview of the appended claims may be made without departing from the true scope and spirit of my invention in its broader aspects.

.What I claim is:

1. In a paper making system, a vat, a cylinder mold rotatably mounted therein, a mixing box, a pump for maintaining a circulation of stock between the vat and box and means in said vat for by-passing a portion only of said stock to the pool about the mold. X

2. In a paper making system, a vat, a cylinder mold rotatably mounted therein, a pump for supplying stock to said vat in quantities in excess of that required for said mold, means for recirculating the excess stock through said pump and vat, and means for withdrawing stock from circulation and delivering it to said mold at a rate approximating its capacity to utilize the same.

3. In a paper making machine of the cylinder type including a mold, a vat having spaced bailles therein located at one side of the mold and pro-- vided between said bailles with an opening for the admission of stock to said vat, and an opening,

located on the opposite side of one of said baiiles recirculating the excess stock between the machine and the source ofsupply thereof.

5. The method of making paper on a cylinder machine which comprises supplying stock to said machine in substantially unlimited volume, by-passing stock to the cylinder of said machine from said supply at a rate approximating the capacity of said cylinder to utilize the same, whereby a substantially quiescent Ipool of stock is maintained about said cylinder, and recirculating the excess stock between the machine and the source of supply thereof.

6; A paper making machine, comprising a vat, a cylinder mold rotatively mounted therein, means for supplying stock to said vatinquantities in excess of the capacity of said mold, means for recirculating the excess stock between said vet and said supplying means, and means for adjusting-the supply of stock passing to and about the mold to a quantity approximating the capacity of the mold; whereby relatively large volumes of stock are maintained in circulation zvithout disturbing eifect upon the mat forma ion.

'7. In a paper making system,.the combination with a cylinder machine including a mold, .of a source of stock supply therefor, means for circulating stock between said machine and said source of supply, and means for continuously withdrawing stock from circulation and'supplying it to said mold at a rate approximating the capacity of the mold to utilize the same; whereby rapid flow of stock about said mold tending to disturb the formation thereon is avoided.

8. The method of making paper on acylinder machine which comprises continuously circulating stock through said machine and a source of supply thereof at a rate substantially in excess of the rate at which stock can be utilized by said machine, and continuously segregating from the circulation and delivering to the cylinder pool of said machine stock at a rate approximating the rate at which it is utilized by said machine.

9. The method of making paper on a cylinder machine which comprises continuously circulating stock through said machine and a source of supply thereof. at a rate substantially in excess of the rate at which stock can be utilized by by said machine, continuously segregating from the circulation and delivering to the cylinder pool of said machine stock at a rate approximating the rate at which it is utilized by said machine, andecombining the white water from said machine with the circulating stock.

10. In a cylinder machine, a vat, a pump for withdrawing white water from said vat, means for supplying stock to said machine substantially in excess of its capacity, and a pipe connection between said pump and vat for withdrawing therefrom, together with the white water, stock supplied to said machine in excess of that utilized thereby.

11. A vat for a cylinder machine adapted to permit a cylinder moldto be rotatively mounted in one end thereof said vat having an openingvided with means for varying the height clone of said partitions.

13. The structure set forth in claim 11 provided with means for varying the height of the partition over which the stock flows in a direction away from the mold end of the vat.

14. A paper making machine comprising a vat provided with openings therein for the ingress and egress of stock, a bathe in said vat between said openings, and a cylinder mold rotatably mounted in said vat between said baflle and said opening for the egress of stock; said vat being provided with a third opening for the egress of stock in excess of that required by the mold and located on the opposite side of said bame from said mold.

15. A paper making machine comprising a vat having openings therein for the ingress and egress of stock, a cylinder mold rotatably mounted in said vat intermediate said openings, a first baflle in said vat intermediate said mold and ingress opening, and a second baflle in said tank on the opposite side of said ingress opening from the first mentioned baille; said vat being provided with a second opening for the egress of stock in excess or that required by said mold and located on the opposite side of said second baflle from the ingress opening.

' HARRY W. FIEBERTS. 

